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MONTREAL — When Luka Magnotta mailed Jun Lin's hands and feet to political parties and two schools, he gift-wrapped them in pink tissue paper and referenced the prime minister and his wife in one of the boxes, his murder trial heard Tuesday.

A note accompanying a body part sent to Conservative headquarters in Ottawa read "Stephen Harper and Lauren Teskey will know who this is. They f***ed up big time!"

The notewriter signed with a black heart and misspelled Laureen Harper's first name while referencing her by her maiden name.

Forensic analyst Chantal Turmel also gave shocking testimony in a calm voice, describing the contents of a video clip posted online "showing a victim being dismembered."

"In the video, a victim can be seen on a bed with a poster of the film Casablanca on the wall above the bed," she said. "A little bit later in the video, a bottle of wine is used to sodomize the victim."

The court was shown the 750ml Wishful Love bottle, found at the scene.

Asked to describe the smell of the blood-soaked mattress, Turmel replied: "There was an odour of rotting blood."

Another forensic analyst showed the court a photo of a human head, with nearly half the skin and flesh missing, that was barely recognizable as human save for a few dark wisps of hair.

Police recovered the head, which the Crown says was Lin's, at a Montreal park on Canada Day 2012, a month after the murder.

Magnotta, sporting dark-rimmed glasses, kept his head bowed during the entire presentation related to the head.